Hello and thanks for the query
No, tailbone injury
and rib pain
are not related t each other. The pain in rib area may be due muscular spam or due to injury yo haven't noticed.
Get your X-rays done and rule out any type of fractures. Till you consult your doctor take complete bed rest
and anti- inflammatory drugs. After 24 hours of injury hot fermentation and local gel application helps you to reduce pain.
Hope you have got you answer.